Drop mpark variant and require std::variant
As and when std::variant is universally available, look at dropping mpark variant fallback.
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CentOS 8 -
MacOS 11.0 -
MacOS 10.15 -
MacOS 10.14 -
Ubuntu 20.04 -
FreeBSD 12.2 -
VS2019 -
VS2017
Edited by Roger Leigh